LT3007 Series
16
3007fa
For more information www.linear.com/LT3007
APPLICATIONS INFORMATION
Table 5: Effects of Floating Pins
PIN
NUMBER PIN NAME EFFECT COMMENT
1 SHDN LT3007 is in Micropower Shutdown, V
OUT
is Off
2 GND No Effect as Long as Pins 3 or 4 are Tied to GND
3 GND No Effect as Long as Pins 2 or 4 are Tied to GND
4 GND No Effect as Long as Pins 2 or 3 are Tied to GND
5 IN LT3007 Has No Input Power, V
OUT
is Off
6 NC No Effect
7 OUT V
OUT
Internal to LT3007 is @ V
IN
. V
OUT
Externally Decreases to 0V
8 ADJ V
OUT
Decreases to Less Than Regulated V
OUT
LT3007 Adjustable Version
8 SENSE V
OUT
Increases to @ V
IN
Unless an External Clamp is Added LT3007 Fixed Voltage version.
If the LT3007 IN pin is forced below the OUT pin or the
OUT pin is pulled above the IN pin, input current typically
drops to less than 1µA. This occurs if the LT3007 input is
connected to a discharged (low voltage) battery and either
a backup battery or a second regulator circuit holds up
the output. The state of the SHDN pin has no effect in the
reverse current if OUT is pulled above IN.
Table 4: Effects of Pin-to-Pin Shorts
PIN
NUMBERS PIN NAMES EFFECT COMMENT
1-2 SHDN-GND LT3007 is in Micropower Shutdown, V
OUT
is Off
2-3 GND-GND No Effect. Pins 2, 3 and 4 are Normally Tied to GND
3-4 GND-GND No Effect. Pins 2, 3 and 4 are Normally Tied to GND
5-6 IN-NC No Effect as Long as NC is Floating
6-7 NC-OUT No Effect as Long as NC is Floating
7-8 OUT-ADJ V
OUT
Decreases to 600mV as the Top Resistor in the
V
OUT
Divider is Shorted
LT3007 Adjustable Version
7-8 OUT-SENSE No Effect as These Tw o Pins are Normally Shorted Together LT3007 Fixed Voltage version.
Fault Tolerance
The LT3007 regulators tolerate single fault conditions.
Shorting two adjacent pins together or leaving one single
pin floating does not increase V
OUT
above its regulated
value or cause damage to the LT3007 regulators. How-
ever, the
application circuit must meet the requirements
discussed
in this section to achieve this tolerance level.
Tables 4 and5 show the effects that result from shorting
adjacent pins or from a floating pin, respectively.
